CN210677549U

CN210677549U - Welding and fixing device for table and chair vertical legs

Info

Publication number: CN210677549U
Application number: CN201921749423.8U
Authority: CN
Inventors: 李惠良; 毛寅生; 毛小生
Original assignee: Hangzhou Dacheng Metal Products Co Ltd
Current assignee: Hangzhou Dacheng Metal Products Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-06-05
Anticipated expiration: 2029-10-17

Abstract

The utility model discloses a welded fastening device of table chair footing belongs to the technical field that table chair footing was made. The fixing device comprises a working plate and a plurality of fixing pieces, wherein the working plate is connected with an inclined plate, the fixing pieces are arranged on the inclined plate, and each fixing piece comprises a first fixing part, a second fixing part and a third fixing part; the first fixing part comprises a positioning column vertically fixed on the inclined plate and a first horizontal quick clamp fixed on the inclined plate; the second fixing part comprises a supporting rod fixed on the working plate, a placing groove used for placing the vertical rod is formed in the supporting rod, the placing groove is perpendicular to the inclined plate, two ends of the placing groove are communicated, and the supporting rod is arranged on the outer side of one side, connected with the working plate, of the inclined plate; the third fixed part comprises two extension rods, one end of each extension rod is connected with the corresponding support rod, and the extension rods extend towards one side of the inclined rod and are abutted to the inclined rod. The utility model discloses the realization supplies the manipulator to weld the fixed of work piece.

Description

Welding and fixing device for table and chair vertical legs

Technical Field

The utility model relates to a technical field that table chair footing was made, in particular to welded fastening device of table chair footing.

Background

Nowadays, the panel part and the upright part of most of the tables and chairs are manufactured separately, and the materials of the panel part and the upright part are different; the stand-offs are typically made of metal and may be made up of multiple components such as a base plate and stand-offs that are welded together.

As shown in fig. 1, the workpiece 1 includes a hollow upright 11 with two through ends, a bottom plate 12 welded to a lower end surface of the upright 11, and a connecting rod 13 welded between the bottom plate 12 and the upright 11, where the connecting rod 13 and the upright 11 are round rods. The cross section of bottom plate 12 is isosceles triangle, has seted up the through-hole 121 of grafting pole setting 11 on the bottom plate 12 to and set up six perforation 122 on bottom plate 12, and through-hole 121 and perforation 122 all link up bottom plate 12 thickness direction. The upright rod 11 and the bottom plate 12 are welded at two positions, and the welding positions of the two positions are opposite; the connecting rod 13 is welded to the bottom plate 12 at a position on the side of the inclined rod 131 away from the vertical rod 11.

Two connecting holes 123 for inserting the connecting rod 13 are formed in the bottom plate 12, the upright rod 11 is welded at one end corner of the bottom plate 12, and the two connecting holes 123 are respectively located at the two remaining end corners. The connecting rod 13 includes two inclined rods 131 and a semi-circular rod 132 connecting the two inclined rods 131, one ends of the two inclined rods 131 are respectively inserted into the two connecting holes 123, and the distance between the two inclined rods 131 is gradually reduced from the end connected with the bottom plate 12 to the end connected with the semi-circular rod 132. The center of the semicircular rod 132 is welded to the outer wall surface of the vertical rod 11, the end part of the semicircular rod 132 is connected with the inclined rod 131, and the welding point of the semicircular rod 132 and the vertical rod 11 is located on one side of the semicircular rod 132 far away from the bottom plate 12.

Generally, the welding is carried out by the manual work among the prior art, and along with automatic development, the manipulator welding gets into the mill gradually, need provide the fixing device who is adapted to the manipulator welding, fixes this work piece, supplies the manipulator to weld.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a welded fastening device of table chair footing has reached cooperation manipulator welded effect.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a welding and fixing device for table and chair vertical legs comprises a working plate and a plurality of fixing pieces for fixing workpieces, wherein the working plate is connected with an inclined plate, the fixing pieces are arranged on the inclined plate, and each fixing piece comprises a first fixing part for fixing a bottom plate, a second fixing part for fixing a vertical rod and a third fixing part for fixing a connecting rod; the first fixing part comprises a positioning column which is vertically fixed on the inclined plate and is used for penetrating through the through hole, and a first horizontal type quick clamp which is fixed on the inclined plate and is used for fixing the bottom plate; the second fixing part comprises a supporting rod fixed on the working plate, a placing groove used for placing the vertical rod is formed in the supporting rod, the placing groove is perpendicular to the inclined plate, two ends of the placing groove are communicated with one side close to the inclined rod, and the supporting rod is arranged on the outer side of one side, connected with the working plate, of the inclined plate; the third fixing part comprises two extension rods, one ends of the extension rods are connected with the supporting rods, and the extension rods extend to one side of the inclined rod and are abutted against the inclined rod; the distance between the inclined plate and the working plate is increased from the position of the vertical rod to the position of the inclined rod.

Adopt above-mentioned technical scheme, aim at the perforation of bottom plate the reference column and put on the hang plate, peg graft pole setting one end in the through-hole on floor again, the other end is placed in the standing groove, realizes the location and the support of pole setting, passes the connecting rod again between two extension rods to peg graft the tip in the connecting hole of bottom plate, the semicircle pole butt is in the pole setting outer wall, realizes location and connection between the three part, is being fixed in the hang plate through first horizontal quick clamp with the bottom plate on.

Set up the hang plate in this scheme, set up bottom plate, hang rod, pole setting one end on the hang plate, and the bracing piece sets up on the working plate, and the junction and the backup pad of pole setting and bottom plate are the interval and set up, can provide the space for the removal and the welding of manipulator, and the bracing piece can not disturb welded going on, can provide the support for the pole setting simultaneously, improves the stability of pole setting. First horizontal active grab is fixed in the bottom plate on the hang plate, ensures bottom plate and hang plate butt, the stability of work piece when improving the welding. On the other hand, the two inclined rods are abutted against the inner wall surfaces of the extension rods, the inclined rods are limited between the two extension rods, the possibility of position deviation of the upper half part of the connecting rod is reduced, the connecting rod is integrally arranged, the central position of the semicircular rod is abutted against the vertical rod, positioning is realized, and welding is facilitated; the extension rod is connected with the inclined rod in a butt joint mode, and welding between the semicircular rod and the vertical rod cannot be interfered.

More preferably: a heightening plate parallel to the inclined plate is fixed on the inclined plate, and a workpiece is placed on the heightening plate; the bottom plate covers the cross section of bed hedgehopping board place, and the reference column is fixed in on the bed hedgehopping board.

By adopting the technical scheme, the heightening plate improves the workpiece, the inclined plate is covered by the bottom plate, the heightening plate does not occupy the space on the peripheral side of the bottom plate, more space is provided on the peripheral side of the bottom plate, and the manipulator moves and welds.

More preferably: an auxiliary groove is formed in the surface, abutted to the bottom plate, of the heightening plate, and one side, far away from the center of the bottom plate, of the auxiliary groove is communicated; the auxiliary groove is rotatably connected with a detaching plate, one end of the detaching plate is positioned in the auxiliary groove, the other end of the detaching plate is positioned on the outer side of the heightening plate, and the thickness of the detaching plate is smaller than the depth of the auxiliary groove.

By adopting the technical scheme, the workpiece can be slightly deformed after being heated, if the punched hole is too tight with the clamping of the positioning column, the workpiece can be ejected out by pressing down one end of the detaching plate outside the bottom plate to separate from the positioning column, so that the workpiece can be detached conveniently.

More preferably: the first horizontal type quick clamp is provided with two and is respectively abutted against the bottom plates of two sides of the supporting rod, which are close to and far away from the vertical rod.

By adopting the technical scheme, the welding points are positioned on two sides of the first horizontal type quick clamp, so that the first horizontal type quick clamp is ensured to fix the bottom plate, and meanwhile, the welding is not interfered.

More preferably: the supporting rod is provided with a propping piece used for propping the vertical rod on the inclined plate, and one end of the vertical rod far away from the bottom plate extends out of the supporting liver; the abutting piece comprises an abutting plate connected to the side face, far away from the inclined plate, of the supporting rod, and a fixing bolt for fixing the abutting plate and the supporting rod, and the abutting plate portion is abutted to the end face of the vertical rod.

By adopting the technical scheme, if the upright stanchion is not tightly propped, the relative positions of the bottom plate and the upright stanchion can be different in different workpieces, the heights of the workpieces obtained after welding can be different, and the quality stability of the workpieces can be reduced; after the vertical rod is placed in the placing groove, the abutting plate is fixed on the supporting rod through the fixing bolt, the abutting plate abuts against the end face of the vertical rod, the vertical rod penetrates through the through hole to abut against the heightening plate, fixing of the relative position between the bottom plate and the vertical rod is achieved, and stability of workpiece quality is improved.

More preferably: the fixing bolt comprises a threaded section and a rod penetrating section without threads, the cross section area of the rod penetrating section is smaller than that of the threaded section, the threaded section is connected to two ends of the rod penetrating section, and the fastening plate penetrates through the rod penetrating section.

Adopt above-mentioned technical scheme, the butt board rotates to be connected in wearing the pole section, rotates fixing bolt, in case support tight board and backup pad do not support tightly, the butt board just can rotate around wearing the pole section to rotate the butt board to break away from the pole setting terminal surface, thereby take off the pole setting, need not to take off fixing bolt is whole, makes things convenient for the change of work piece.

More preferably: the third fixing part also comprises a second horizontal type quick clamp, an auxiliary rod is fixed on the supporting rod, and the second horizontal type quick clamp is fixed on the auxiliary rod; the second horizontal type rapid clamp comprises a second pressing block, a fixing plate is fixed on the second pressing block, and the fixing plate is abutted to one side, away from the vertical rod, of the two inclined rods.

Adopt above-mentioned technical scheme, peg graft in the connecting hole with slope pole one end to with slope pole butt back in the extension rod, with the fixed plate butt in the slope pole outside, ensure semicircle pole and pole setting butt, make things convenient for the welded to go on.

More preferably: one side of the inclined plate, which is close to the supporting rod, is rotatably connected with the working plate, and the working plate is provided with an adjusting piece for adjusting the inclination degree of the inclined plate; the regulating part comprises a motor, a rotating rod fixed with a motor output shaft and abutted against the supporting plate, a cam fixed on the rotating rod, an outer wall surface of the cam abutted against the inclined plate, and a supporting plate fixed on the working plate and used for supporting the rotating rod.

Adopt above-mentioned technical scheme, when the motor rotated, the different positions and the hang plate butt of cam because the distance between cam and the dwang is different, caused the different positions of cam to the degree of raising of hang plate different, realized the regulation of hang plate one side height to realize the regulation of hang plate slope degree, so that adjust the interval space between vaulting pole and the pole setting, and the slope degree of work piece. After welding, the inclination angle of the inclined plate can be reduced, and then the workpiece is taken down.

To sum up, the utility model discloses following beneficial effect has:

1. the bottom plate, the upright posts and the connecting rods are positioned and preliminarily fixed by arranging the positioning columns, the first horizontal type quick clamp, the supporting rods, the extension rods and the inclined plates, and meanwhile, a movable operation space is provided for welding of a manipulator;

2. by arranging the heightening plate, more space is provided on the peripheral side of the bottom plate for the moving and welding of a manipulator;

3. the vertical rods are abutted against the bottom plate through the abutting pieces, so that the relative positions of the bottom plate and the vertical rods are fixed, and the stability of the quality of a workpiece is improved;

4. the inclination angle of the inclined plate is adjusted by arranging the adjusting piece so as to adjust the spacing space between the support rod and the upright rod and the inclination degree of the workpiece; after welding, the inclination angle of the inclined plate can be reduced, and then the workpiece is taken down.

Drawings

FIG. 1 is a schematic structural view of a prior art table and chair leg piece;

FIG. 2 is a schematic structural view of embodiment 1;

FIG. 3 is a schematic diagram of a portion of the structure of FIG. 1;

FIG. 4 is a schematic structural view of example 2;

fig. 5 is a schematic structural view of a portion of the structure of fig. 4.

Reference numerals: 1. a workpiece; 11. erecting a rod; 12. a base plate; 121. a through hole; 122. perforating; 123. connecting holes; 13. a connecting rod; 131. an inclined lever; 132. a semi-circular rod; 2. a working plate; 21. an inclined plate; 22. a compensation block; 3. a step-up plate; 31. an auxiliary groove; 32. disassembling the plate; 4. a fixing member; 5. a first fixed part; 51. a positioning column; 52. a first horizontal type quick clamp; 6. a second fixed part; 61. a support bar; 62. a placement groove; 7. a third fixed part; 71. an extension rod; 72. a second horizontal type quick clamp; 721. a second pressing block; 73. an auxiliary lever; 74. a fixing plate; 8. an abutting piece; 81. fixing the bolt; 811. a threaded segment; 812. a rod penetrating section; 9. a propping plate; 91. a fixed section; 92. a connecting section; 93. an abutment section; 10. an adjustment member; 101. a motor; 102. rotating the rod; 103. a cam; 104. and a support plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1: for convenience of illustration, the workpiece 1 introduced into the standing leg of the table and chair in the present embodiment includes, as shown in fig. 1, a hollow standing leg 11 with two ends penetrating through, a bottom plate 12 welded to the lower end surface of the standing leg 11, and a connecting rod 13 welded between the bottom plate 12 and the standing leg 11, where the connecting rod 13 and the standing leg 11 are round rods. The cross section of bottom plate 12 is isosceles triangle, has seted up the through-hole 121 of grafting pole setting 11 on the bottom plate 12 to and set up six perforation 122 on bottom plate 12, and through-hole 121 and perforation 122 all link up bottom plate 12 thickness direction. The upright rod 11 and the bottom plate 12 are welded at two positions, and the welding positions of the two positions are opposite; the connecting rod 13 is welded to the bottom plate 12 at a position on the side of the inclined rod 131 away from the vertical rod 11.

A welding and fixing device for a table and chair vertical leg comprises a horizontally arranged working plate 2, an inclined plate 21 fixed on the upper surface of the working plate 2, and a plurality of fixing pieces 4 arranged on the inclined plate 21, wherein the fixing pieces 4 are arranged along the length direction of the inclined plate 21.

The cross section of working plate 2 is the rectangle, is fixed with the compensation piece 22 that the cross section is L shape on the working plate 2, and end face working plate 2 is fixed under the compensation piece 22 horizontal part, and 21 sides of hang plate are fixed with working plate 2, and the opposite side upwards inclines to extend, and the lower surface supports and fixes with compensation piece 22 vertical portion up end butt.

A plurality of heightening plates 3 corresponding to the fixing pieces 4 in number are fixed in parallel on the inclined plate 21, and the cross section shape and size of the heightening plate 3 are the same as those of the bottom plate 12.

As shown in fig. 3, the fixing member 4 includes a first fixing portion 5 provided on the raised plate 3 for fixing the bottom plate 12, a second fixing portion 6 provided on the work plate 2 for supporting the upright 11, and a third fixing portion 7 provided on the second fixing portion 6 for fixing the connecting rod 13. The first fixing portion 5 includes three positioning posts 51 vertically fixed on the raising plate 3 and two first horizontal quick clamps fixed on the inclined plate 21, and the three positioning posts 51 correspond to any three through holes 122.

Two first horizontal type quick clamps 52 are respectively pressed on two opposite sides of the vertical rod 11, one of the first horizontal type quick clamps is fixed on one side of the inclined rod 131 far away from the vertical rod 11 and pressed between the two inclined rods 131, and the other one of the first horizontal type quick clamps is fixed on one side of the vertical rod 11 close to the inclined rod 131.

The second fixing portion 6 includes a supporting rod 61 vertically fixed on the working plate 2 and having a rectangular cross section, and a placing groove 62 formed on the supporting rod 61, the supporting rod 61 is located on a side of the upright 11 away from the inclined rod 131, and a first horizontal quick clamp is pressed on a region of the bottom plate 12 between the upright 11 and the supporting rod 61. The cross section of the placing groove 62 is semicircular and is matched and abutted with the outer curved surface of the upright rod 11; the placement groove 62 is formed along the setting inclination direction perpendicular to the inclined plate 21, and both ends of the placement groove 62 in the length direction and the side away from the work plate 2 are penetrated.

The third fixing portion 7 includes two extending rods 71 with one end fixed to the support rod 61 and a rectangular cross section, and a second horizontal type quick clamp 72 for abutting the semi-circular rod 132 against the outer surface of the upright 11. The two extension rods 71 are respectively horizontally fixed at two sides of the support rod 61 in the length direction and extend towards one side of the upright rod 11; the extension rod 71 is inclined to a side away from the vertical rod 11 from one end fixed to the support rod 61 to the other end. The vertical rod 11 is located between the two extending rods 71, and the side surfaces of the two extending rods 71 close to the vertical rod 11 are correspondingly abutted with the two inclined rods 131.

The second horizontal type quick clamp 72 is horizontally arranged and fixed with the support rod 61 through an auxiliary rod 73 with an L-shaped cross section, and the second horizontal type quick clamp 72 is positioned above the extension rod 71. The second horizontal type quick clamp 72 includes a second pressing block 721, a fixing plate 74 is fixed on the second pressing block 721, and the fixing plate 74 abuts against one side of the two inclined rods 131 far away from the vertical rod 11.

The implementation principle of the embodiment is as follows: aligning the through hole 122 on the bottom plate 12 with the positioning column 51, installing the bottom plate 12 on the raised plate 3, inserting one end of the upright rod 11 into the through hole 121, positioning the other end of the upright rod in the placing groove 62, and finally inserting the two ends of the connecting rod 13 into the connecting hole 123, wherein the inclined rod 131 abuts against the extension rod 71; the first horizontal type quick clamp 52 and the second horizontal type quick clamp 72 are pressed on the bottom plate 12 and the inclined rod 131, and the installation of the workpiece 1 is completed. And starting the mechanical arm to weld and fix the workpiece 1.

Example 2: a welding and fixing device for a table and chair vertical leg is shown in figure 4, and the difference between the embodiment and the embodiment 1 is that:

one side of the inclined plate 21 close to the support rod 61 is rotatably connected with the working plate 2, an adjusting piece 10 for adjusting the inclination angle of the inclined plate 21 is arranged on the working plate 2 corresponding to the other side, and the adjusting piece 10 is arranged between the inclined plate 21 and the working plate 2. The adjuster 10 includes a motor 101 horizontally fixed to the work plate 2, a rotating lever 102 horizontally fixed to an output shaft of the motor 101, and a cam 103 fitted around and fixed to an outer surface of the rotating lever 102, and an outer wall surface of the cam 103 abuts against the inclined plate 21. Two supporting plates 104 are fixed on the working plate 2, and two ends of the rotating rod 102 penetrate through the supporting plates 104.

As shown in fig. 5, an auxiliary groove 31 with a rectangular cross section is vertically formed in the upper surface of the heightening plate 3, and one side of the auxiliary groove 31, which is far away from the central position of the heightening plate 3, is through; the auxiliary groove 31 is rotatably connected with a detaching plate 32, the thickness of the detaching plate 32 is smaller than that of the auxiliary groove 31, the central position of the detaching plate 32 is rotatably connected with the penetrating side of the auxiliary groove 31 far away from the central position of the heightening plate 3, and the rotating connection direction is parallel to the side edge of the heightening plate 3.

One end of the vertical rod 11 extends to the outside of one side of the placing groove 62 far away from the bottom plate 12, and the supporting rod 61 is provided with a tightly supporting piece 8 for tightly supporting the vertical rod 11 on the heightening plate 3. The abutting piece 8 comprises an abutting plate 9 abutted against the end face of the vertical rod 11, a fixing bolt 81 for fixing the abutting plate 9 and the supporting rod 61, and the abutting plate 9 comprises a fixing section 91 abutted against the vertical side face of the supporting plate 104 far away from the workpiece 1, an abutting section abutted against the end face of the vertical rod 11, a horizontal connecting fixing section 91 and a connecting section 92 abutted against the section 93. The fixing bolt 81 comprises two threaded sections 811 and a rod penetrating section 812 arranged between the two threaded sections 811, the fixing section 91 is rotatably connected in the rod penetrating section 812, the cross-sectional area of the rod penetrating section 812 is smaller than that of the threaded sections 811, and the fixing section 91 cannot enter the threaded sections 811.

The implementation principle of the embodiment is as follows: aligning the through hole 122 on the bottom plate 12 with the positioning column 51, installing the bottom plate 12 on the raised plate 3, inserting one end of the upright rod 11 into the through hole 121, positioning the other end of the upright rod in the placing groove 62, and finally inserting the two ends of the connecting rod 13 into the connecting hole 123, wherein the inclined rod 131 abuts against the extension rod 71; the first horizontal type quick clamp 52 and the second horizontal type quick clamp 72 are pressed on the bottom plate 12 and the inclined rod 131, and the installation of the workpiece 1 is completed. The abutting plate 9 abuts against the end face of the upright rod 11, and the fixing bolt 81 is tightened. And starting the mechanical arm to weld and fix the workpiece 1. After welding, the fixing bolt 81 is loosened, the abutting plate 9 is rotated to be separated from the end face of the vertical rod 11, the motor 101 is started to lower the height of one side of the inclined plate 21, the dismounting plate 32 is pressed downwards to separate the workpiece 1 from the surface of the heightening plate 3, and the workpiece 1 is dismounted.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A welding and fixing device for table and chair vertical legs comprises a working plate (2) and a plurality of fixing pieces (4) used for fixing workpieces (1), and is characterized in that the working plate (2) is connected with an inclined plate (21), the fixing pieces (4) are arranged on the inclined plate (21), and each fixing piece (4) comprises a first fixing part (5) used for fixing a bottom plate (12), a second fixing part (6) used for fixing a vertical rod (11), and a third fixing part (7) used for fixing a connecting rod (13); the first fixing part (5) comprises a positioning column (51) which is vertically fixed on the inclined plate (21) and is used for penetrating through the through hole (122), and a first horizontal type quick clamp (52) which is fixed on the inclined plate (21) and is used for fixing the bottom plate (12); the second fixing part (6) comprises a supporting rod (61) fixed on the working plate (2), a placing groove (62) used for placing the vertical rod (11) is formed in the supporting rod (61), the placing groove (62) is perpendicular to the inclined plate (21), two ends of the placing groove and one side close to the inclined rod (131) are communicated, and the supporting rod (61) is arranged on the outer side of one side, connected with the working plate (2), of the inclined plate (21); the third fixing part (7) comprises two extension rods (71) with one ends connected with the supporting rod (61), and the extension rods (71) extend towards one side of the inclined rod (131) and are abutted against the inclined rod (131); from the position of the vertical rod (11) to the position of the inclined rod (131), the distance between the inclined plate (21) and the working plate (2) is increased.

2. The welding and fixing device for the table and chair vertical leg is characterized in that a heightening plate (3) parallel to the inclined plate (21) is fixed on the inclined plate (21), and the workpiece (1) is placed on the heightening plate (3); the bottom plate (12) covers the cross section of the heightening plate (3), and the positioning column (51) is fixed on the heightening plate (3).

3. The welding and fixing device for the table and chair vertical leg is characterized in that an auxiliary groove (31) is formed in the surface, abutted against the bottom plate (12), of the heightening plate (3), and one side, far away from the center of the bottom plate (12), of the auxiliary groove (31) penetrates through the auxiliary groove; the auxiliary groove (31) is rotatably connected with a dismounting plate (32), one end of the dismounting plate (32) is positioned in the auxiliary groove (31), the other end of the dismounting plate is positioned on the outer side of the heightening plate (3), and the thickness of the dismounting plate is smaller than the opening depth of the auxiliary groove (31).

4. A welding fixture for table and chair uprights, according to claim 2, characterized in that said first horizontal quick clamps (52) are provided in two and abut against the bottom plate (12) of the uprights (11) on the sides close to and remote from the supporting bar (61).

5. The welding and fixing device for the table and chair vertical leg is characterized in that the supporting rod (61) is provided with a propping piece (8) for propping the vertical leg (11) against the inclined plate (21), and one end of the vertical leg (11) far away from the bottom plate (12) extends out of the supporting liver; the abutting piece (8) comprises an abutting plate (9) connected to the side face, far away from the inclined plate (21), of the supporting rod (61), a fixing bolt (81) for fixing the abutting plate (9) and the supporting rod (61), and the abutting plate (9) is partially abutted to the end face of the vertical rod (11).

6. The welding and fixing device for the table and chair vertical leg is characterized in that the fixing bolt (81) comprises a threaded section (811) and a rod penetrating section (812) which is not provided with threads, the cross-sectional area of the rod penetrating section (812) is smaller than that of the threaded section (811), the threaded section (811) is connected to two ends of the rod penetrating section (812), and the abutting plate (9) is arranged in the rod penetrating section (812) in a penetrating mode.

7. The welding fixture for table and chair uprights according to claim 1, characterized in that said third fixing portion (7) further comprises a second horizontal quick clamp (72), an auxiliary rod (73) being fixed to the supporting rod (61), the second horizontal quick clamp (72) being fixed to the auxiliary rod (73); the second horizontal type quick clamp (72) comprises a second pressing block (721), a fixing plate (74) is fixed on the second pressing block (721), and the fixing plate (74) abuts against one side, far away from the vertical rod (11), of the two inclined rods (131).

8. The welding and fixing device for the table and chair vertical leg is characterized in that one side of the inclined plate (21) close to the supporting rod (61) is rotatably connected with the working plate (2), and the working plate (2) is provided with an adjusting piece (10) for adjusting the inclination degree of the inclined plate (21); the adjusting piece (10) comprises a motor (101), a rotating rod (102) which is fixed with an output shaft of the motor (101) and is abutted against the supporting plate (104), a cam (103) which is fixed on the rotating rod (102), the outer wall surface of the cam (103) is abutted against the inclined plate (21), and the supporting plate (104) which is used for supporting the rotating rod (102) is fixed on the working plate (2).